VNX8000 DAE cabling
EMC VNX8000 Hardware Information Guide 139
Stacked cabling with forty DAEs in a VNX8000 Block platform
Figure 117 on page 141, Figure 118 on page 142, and Figure 119 on page 143 show a
third example of a VNX8000 Block platform with three racks and forty DAEs (all are 2U, 25
disk drive DAEs) or a VNX8000 platform with a total of 1000 disk drives. This example
shows the stacked cabling with three 40U racks, the first rack having ten DAEs, the
second rack having twenty DAEs, and the third and final rack having ten DAEs.
Note: If you want to use the 3U, 15 disk drive DAE, six 40U racks would be necessary. So,
in this situation, the first rack would have seven DAEs (reserving 10U of space for
File/Unified hardware). The second through fifth racks would have thirteen DAEs each.
And, the sixth and final rack would have seven DAEs for a total DAE count of sixty-six with
a disk drive count of 990.
The SAS ports on the 6-Gb/s SAS I/O module in each SP of the VNX8000 platform SPE are
labeled 0, 1, 2 and 3.
In Figure 117 on page 141, Figure 118 on page 142, and Figure 119 on page 143 notice
that each DAE device supports two completely redundant buses on LCC A and LCC B.
Since forty DAEs are available for a maximum of 1000 disk drives, it is recommended that
the DAEs be load balanced. To do this, it is recommended that you daisy-chain the DAEs
for the most efficient load balancing. So, in Figure 117 on page 141, Figure 118 on
page 142, and Figure 119 on page 143 four buses (Bus 0, Bus 1, Bus 2, and Bus 3) are
available.
The DAEs shown in Figure 117 on page 141, Figure 118 on page 142, and Figure 119 on
page 143 are:
Rack 1, bus 0
◆ DAE 1, orange, 6-Gb/s SAS I/O module port 0 (SP A) to 1
st
DAE (EA 0/Bus 0) in rack 1
(labels SP A SAS 5 Port 0 to LCC A)
◆ DAE 1, orange, 6-Gb/s SAS I/O module port 0 (SP B) to 1
st
DAE (EA 0/Bus 0) in rack 1
(labels SP B SAS 5 Port 0 to LCC B)
Then, the orange DAEs for Bus 0 are daisy-chained through the remaining DAEs:
◆ DAE 2 or EA 1/Bus 0 and continue cabling the DAEs up to EA 9/Bus 0.
Rack 2, bus 1
◆ DAE 1, blue, 6-Gb/s SAS I/O module port 1 (SP A) to 1
st
DAE (EA 0/Bus 1) in rack 2
(labels SP A SAS 5 Port 1 to LCC A)
◆ DAE 1, blue, 6-Gb/s SAS I/O module port 1 (SP B) to 1
st
DAE (EA 0/Bus 1) in rack 2
(labels SP B SAS 5 Port 1 to LCC B)
Then, the blue DAEs for Bus 1 are daisy-chained through the remaining DAEs:
◆ DAE 2 or EA 1/Bus 1 and continue cabling the DAEs up to EA 9/Bus 1.
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